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<blockquote data-quote="Shin Okada" data-source="post: 1972130" data-attributes="member: 1956">SpellsBasically, spellcasting abilities are never improved when you advance monsters by HD. If you want to give them higher spell-casting ability, you must let them advance by adding appropriate class levels. For example, if you add 18 HD to a Spirit Naga, it is now a 27 HD huge monster. But it still casts spells as a 7th-level sorcerer. But if you add 10 levels of sorcerer class to a 9HD Spirit Naga, it now casts spells as a 17th level Sorcerer. It has 9 levels in racial HD (d8) and 10 levels in Sorcerer (10d4 HD).Spell-Like abilitiesAgain, basically, advancing in HD never give creature a higher caster level or something. Sometimes, especially in the case of template monsters, the descriptive text of spell-like abilities say &quot;Caster level equals the creature's HD&quot; or something. In this case, if the creature's HD increases, then the caster level increases, too. But otherwise, increase in HD does not raise CL.</blockquote>

[QUOTE="Shin Okada, post: 1972130, member: 1956"] Spells Basically, spellcasting abilities are never improved when you advance monsters by HD. If you want to give them higher spell-casting ability, you must let them advance by adding appropriate class levels. For example, if you add 18 HD to a Spirit Naga, it is now a 27 HD huge monster. But it still casts spells as a 7th-level sorcerer. But if you add 10 levels of sorcerer class to a 9HD Spirit Naga, it now casts spells as a 17th level Sorcerer. It has 9 levels in racial HD (d8) and 10 levels in Sorcerer (10d4 HD). Spell-Like abilities Again, basically, advancing in HD never give creature a higher caster level or something. Sometimes, especially in the case of template monsters, the descriptive text of spell-like abilities say "Caster level equals the creature's HD" or something. In this case, if the creature's HD increases, then the caster level increases, too. But otherwise, increase in HD does not raise CL. [/QUOTE]

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